Presentation on theme: "Happy Autumnal Equinox!! Periods 1,2,4--Sign in to Edmodo and tell the class what you did over the break. Then glue in the rock cycle song. 3 rd period."— Presentation transcript:
Happy Autumnal Equinox!! Periods 1,2,4--Sign in to Edmodo and tell the class what you did over the break. Then glue in the rock cycle song. 3 rd period only—Just glue in the rock cycle song.
Classified by Texture: Fast Cooling Lava (Extrusive) Fine-Grained, small crystals, smooth Slow Cooling Magma (Intrusive) Coarse-Grained, large crystals, rough
How fast do these rocks cool? Extrusive: Fast cooling lava (Fine-Grained or glassy texture.) Intrusive: Slow cooling Magma. (Ex. Coarse- Grained, large crystals. Smooth & rough.) Left Side Right Side
An intrusive igneous rock would have what type of texture? Why? Coarse-Grained, large crystals. Smooth & rough. It is hotter in the earth than on the outside of the earth so it takes longer for magma to cool down.
Igneous rock Intrusive rock Magma Lava Extrusive Rock Small Crystals Large Crystals Inside Earth At or near surface Fine Grained Coarse-grained Cools fast Cools slowly
Classified by Mineral Composition: Mafic describes dark colored rocks because of low silica (basalt, peridotite) Felsic describes light colored rocks because of high silica (granite, rhyolite )
Dark vs. Light Minerals? Mafic describes dark colored rocks Felsic describes light colored rocks Left Side Right Side
Mineral Composition Igneous Rocks Granite is made of: Feldspar, Mica, Quartz, Horneblende (dark) Rhyolite is made of: Feldspar, Mica, Quartz, Horneblende Obsidian is made of: Quartz, Iron, Magnesium
How do you use igneous rocks? Tools Gravel Buildings Cleaning Streets Polishing Bridges Gardening
Mount Rushmore –more information https://www.youtube.com/watch?v=0Cq7MNqujZg
Closing One Sentence Summarizer: Students will compose one sentence summarizing the day’s lesson.
Bell Ringer 9/2/14 If you where given this mineral how would you go about identifying it? Color: Blue-green Hardness: 6 Luster: Non-Metalic Streak: White Name: Lazulite